污水与废弃物通过工厂管道正确排放，不能成为接触面，产品，原料与供应水的潜在污染源。

Sewage and waste disposal is properly plumbed from the facility and does not provide a potential source of contamination to contact surfaces, products, components, water supplies, etc.

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所以如果胡萝卜被切块后煮食，胡萝卜与水的接触面增多，那么丢失的养分也会增多。

If the carrot is cut before being boiled, the surface area becomes much greater — and so the loss of nutrients is increased.

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